Version: add a dummy source file so that some versions of csc.exe won't give error 2008, killing the build scripts

Version/version.csproj

@@ -70,6 +70,9 @@
   <PropertyGroup>
     <PreBuildEvent>"$(ProjectDir)..\Build\BizHawk.Build.Tool.exe" GIT_REV --wc "$(ProjectDir).." --template "$(ProjectDir)svnrev_template" --out "$(ProjectDir)svnrev.cs"</PreBuildEvent>
   </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="dummy.cs" />
+  </ItemGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">